diff -r f0fc70b6f8f9 -r 2a6d83f4677e src/chess/knight.c
--- a/src/chess/knight.c	Thu Jul 30 18:34:15 2026 +0200
+++ b/src/chess/knight.c	Thu Jul 30 19:17:38 2026 +0200
@@ -31,7 +31,7 @@
 #include "rules.h"
 #include <stdlib.h>
 
-bool knight_chkrules(Move *move) {
+bool knight_chkrules(const Move *move) {
     int dx = abs(move->fromfile - move->tofile);
     int dy = abs(move->fromrow - move->torow);